Furnace.



JI. A. 4BMDBURN.

PURNACE.- APPLIoAijIoN FILED JUNE 27, 190s.

INVENTOR ATTGRNNS rasanas iosnrnn. BRADBURN, or syancu'su, NEW Yoan.

shannon.

Specification of Letters Patent.

raten/eed ret. a, 190e.

Applicatimmed .rune .'27, 1 908. seria No. 440,645.

To all whom it may concern.'

Be it known that I, JOSEPH A. BRADBURN, a citizen of the United States of America and residing at Syracuse, in the county of Onondaga and State of New York, have invented a certain newv and useful Improve ment in Furnaces, of which the following is a specification. A A My invention relates to 'furnaces and bari ticularly to down draft furnaces, the object of my invention being to produce .a simply constructed furnace of the down draft vtype i ,which will effectually consume the coalgases and smoke, and maybe either fitted to a stove, range, or other heating appliance of the ordinary. type or form an integral portion. of an independent structure.

ln the acompan ing drawings, Figure 1 is a vertical section o a furnace illustrating my invention in one form; Fig. 2 is asection of the same at right angles thereto; Fig. 3 is a front elevation of the saine; Fig. 4 is a vertical elevation partly infseotion showingr my device applied to a hot airfurnace; Fig. 5 is a similar view showing my device applied to a plurality of air heaters; Fig. 6 is a similar view showing-a range supplied with my device; and Fig. 7 is a similar viewof a furnace inv which my device is incorporated as an` integral part.

Referring to the drawings my devicein the form shown, comprises a fire box 10, suitably lined with fire brick 11, 'car1-ied by a easing 12of any suitable material, 'for example cast l or sheet iron. A grate 14 separates the fire boxfrom the ash pit 15 into which the ash pit door 16 and the bottoni draft regulator 17 o en as is customer The port 13. ermite t e feed of .fuel to t e fire box anda c acts as an air inlet as hereinafter described. Surrounding the 12 and separated tliere from by an airspace, I mount on brackets 19 a hood 18 which extends down to theash'pit."

This hood may be constructed in anysuitable manner, but preferably comprises an outer shell 20 of sheet or'cast iron and an inner linin 21 of sheet iron with a heat insulater 22 asbestos, -iire brick, air or other suitable substance) separating -thej'same., 50 hinged 'feed ,door 23 opens opposlte the port' 13 and carries a late 24 mounted on the screw 25 by which the. admission of air through the port 13 may be suitably.regu-v lated by means of the handle 26. Poker S5 holes 27 are openedas desired through the face and sides, of the re bx land hood, the

space between the hood and casing 12 being occupied at these points by hollow cones 28. Swinging covers 29 areifitted over the holes to prevent the escape of dust or gases from the' 'fire box. By using Vthe 4poker through the various poker holes, the fire may be well stirred and passa es forl air made in any d`i-y rection through t e bod ofthe fuel. or more outlet flues 30 plyaced low in the fire box and below the normal level of the fuel o pen from the back (Fig. 1) or side (Fig. 5) of "t e' fire box. This outlet flue may extend across the entire back ofthe fire box, as showninFig. 2, in order to give an ample draft.

Toprevent the escape of ash whichmay be carried to the flue anddrop'ped down in' the air space` between the casing 12 and the `hood 18, I arrange an'apron 31 beneath the flue and open a passage into the ash pit at this point so that the ashes fallin from the flue 30 will be carried down into t e ash pit.

A slide 32 ma be arranged-'in this 'passage in order to regu ate the size of the opening for the urposes hereinafter referred to. A smal flue 33 1'11 the top of the fire box, closed by a damper 34, is arra 0red to permit the escape of gases from the re. box to the air space between thehood and the casing 12. A second damper 35 may be arranged at another point in-this air passage to permit the regulation of the flow of airor gas therethrough.

The 'operation of this furnace is as follows With the damper 1 7 open to full capacity and the damper 35 closing the air ia'ssage between the hood in the casing and t e plate 24 screwed down tight and .the slide 32 closed, a-ire is built in the fire box, all the draft coming from below. After the fire is Well started the damper 17 may be closed and fthen the plate 24`screwed' out so as to permit'tl'1e-air-which is drawn up underneath the hood'to enter the fire box through the port 13 thus opening a down-draft'to the.

fire.l It will be noted that inasmuch as'the lower edge of the.,hood is below thev outlet flue 30, the arrangement produces afsiphoni-l like action. If from any reason the chinncydraft is disturbed or weak, the gases in thefu'rnace rise to the tcp of the fire box and vmay enter the air space between the hood and the casing, but they will not'deseend to the opening at the bottom of the hood because they are opposed by the Incom-inf draft of air which tends to carry' them up an out through the flue; 30 which is above the VCoal so heats lho gasvs lhalfthoy aro ol' sull lulontly high tmupalaturo lio undoilfo oomploto ooiohuslion hf.' tho Slu'lpljv ol' coming l'ifoni allow; oihglow lo tho fluo ISO when said gases have nut Enron consumed in the lire ho): itself. Such pjaoos. as may riso into 'tho space ahi/,wo lho l'uol in lh@ 'lii'o box.

30 escapo thoiolroi'n oithoi 'ilnolagjh 'Lho port 33.

#Whon tho damper 3L is; miami. or through tho lori 13 Whon the plaie 2l is stflouod oui. and flow with tho all' beneath tho hood to tho .flue 3u.

This fumato while capablo ol burning; hard coalI pai'toulax'hf adapthd to hui'n sol't coal and may ho attached to an)vv oltho oi'dina-ry stoves, lanfg-LS and luinucwu in uso i'or don'iostio pui'p'osos, although a apooial op ning l'oi' a pipo 'ionx tho lluo lill may ho iooossiuy in somo cabos vto pi'oont functional doiaug'ouiont.

In Fig'. el ,l have shown nly luinaco attachotl to an ordinary vhot on' l'u nach.. Tho lluo 3U is conduvtod hy a ooial oponingr to the iio box. of tho latter anal heals tho lui'- nace in ,nocisoly tho Sarno inannoi as it would ho heated were a ililo to ho huilt Y Y .ln l? 5 the Vlues 3o open into heating; drums 35 which aro located within hot ail' chalnllors 36.

vln lilly. G any hanane-is attaohod to an ordlnar" Cooking rango and furnishos th'o l *Wiso su ,Yoliecl h "'tho conilnlstion v ll Ff .uol'v heroin. ln ,lr-ig. Y l. have shown my lui-nace forniiug an integral parl, ol a hot air gcnm-alor which has tho advantage that the hoaling ohamhei' lor tho un' is low and thus poiinits the hot ai? pipes loading to tho regis to i'iszo'thoiolromnt a sharper angle than is now gooey-ally possibi@ with tho hot air furnaces in genoral usejy I lh @osea in 'which Imy' fummo@ is appliod. to

Should tho combustion ol' tho gases' tho ash. pit through tho danipol l? ail'.

rangos, Stowos or turnaooa ah'oadi providod with tiro. lions, it is lo ho undoialoud that tho fluo troni my lui'uaco um); ho onnoclvd thoion'ilh at :un doahod poilu, muh thai tho ,haltoi healings xslvin is uol doranffgml.

Many modihcation` olmy dovuo will readily suggest lhonisoh'os lo thorw :diillod in tho` art and l do not linut my: all to tho construction Shown.

l. A lul'navo ol` tho down dral't typo. hav ing agiata and ash-'pit an inc-loacd liro lrox aud an oullot lluo opening*r (hol'vl'i'onx ahox'o tho grato hut hclow lho uppol' sul'laio o tho fuel, in coinliuation with a donn dial'l. con duit openingY into tho 'Iil'o ho allow ho sun iaoo of tho l'uol and having a sul-tion intuito opening to tho atmosphoi'o at a point holouY the outlot lluo.

2. A i'ulnaoo of lho down (l1-all typo. hm'- ing' a gime and aslhpit anv hulokad lli-o llox and an outlet lluooponlng thoi'vl'i'om alvowo thogiato huty l ol 1 w tho uppoi' :uu-lavo ol' tho iuol, in combination with a hood orolsaid lii'o box spaced, thoi'ol'l'onl to l'oi'in an all' pao Hago @tending`r lxzhww the oullol. lluo yand oponing to tho atulos )hoio at 1 hnvor odgo and an nlot l'ioin said an' passaao ahovo the uppi surface ol'lho hurl ,lo permit down draft to tho lilo, auhstantially as dosl'i'ihod.

fl. A l'ui'nuco ol" lho down dlalt typo, havin.;r a gialo and ash-pit au inclosod linx hox and an oullot lluo opening lhoi'oliom ahovo ln` grato hut lxloof tho uppor hlulaco ol' tho luol, in .foiulrinauion with. au air u ply oon-- duit having; ay suction inl alto lwlow tho lovol ol' said l'luo and pas lng mail yald lin lsox to tho latter, togjotlnlwith moans loisupplying lho lilo with a down dlalt tlulolroin l'l'oiu a point allow tho Ruviano ol tho `lla-l.

4. .l furnace of tho down dial't typo, havia; a grato and aslkpit an' iuclorod l'n'o lvox and an outlet lluo opening' lhoiol'i'om aho.Y tho grato hul. below tho uppoi suil'aoo of tho l'uol, in coinhination with an air supply oon-- duit having' a suction intake. l rolow tho lovol ol: .said lluo' and passing.: over said lil'o ho); to tho lal'l'oi',` said liio llo); hafvi'ilg a. controlled port oponiuathrough ils top into said Conduit as and lol' tho purposes dosoi'illod.

5. A l'urnaoo olI tho down draft typo, havinga giallo and ash-pit an inolosod liro hox and au outhl, ihn` opening thorol'ifinn ahovo tho grato hut holow tho uppm .sul'laco of tho luci, ln Conihuation with au aii supply conduit haYing a suctioi'x intalio hulow tho lowl of salilhw and 'lashing ovoi .Quid 'llro hox to .ld ln'o hox. havingy a. vontrollml port opcnii-lr' duit and moans iol' admitting a. sumlloinon tal ail* sup )ly to tho fluo from tho ash pit, sillistantially s desoi'ihod.

i6. A luruaco of tho down draft typo, haw ingr a grato and ash--plt an inolosod liro hop; and an outlet lille opening therefrom above lll through its top intosaid con the grate but below the upper surface of the fuel, 2in eomlnation with la hood over said re box spaoed therefrom to form an air passage extending below the loutlet flue and opening to the atmos here at its lower edge assage :above the and an-inlet from sai air upper surface of thefue to ermitdown draft to the re, saidrebox :wing a p1urality of poker holes o ening throughl said hood and fire box waff; at different levels above 4the grate, substantially es described.

7. A furnace ofthe down drafttype, hav- .ing a grate and aslbplt an inclosed fire boxwith outlet` therefrom above-the grate but below the surface of the f uel, a hood extending over and around the same and spaced therefrom to afford an air assag'e, said hood extending .below the o'ut et flue and there opening to the atmos here, a fuel feed port opening through said ood and fire box Wall vand means for admitting a down draft therethrough to the'upper surface of the fuel from the space between the hood` and .the fire box, substantially as described.

'8. furnace of the down draft type, hav L ing a grate and ashrpit an inclosed fire box with outlet therefrom abovethe grate but below the'surf'aoe ofthe fuel, a hood `extend ing over and around the same and spacer. therefrom to afford an air assage, said hood extending below the out et ue'and ther@` opening tothe'atmos here, a fuel feed port opening through said flood and fire box wall,

Aa door closin the port in the hood,a plateV carried there y for closing the port in .the

fire box wall and means to controll the position of said plate whereb)T a down draft may bey admitted through the port in the lire box.

rwall to the upper surface of the fuel from the 

